, charlie. this is a state that romney needs to win. he spent every minute here yesterday and the campaign is focusing on his ground game. making phone calls, knocking on doors, just to get that message out. as part of that message, romney yesterday hit on a familiar theme, but it was from a pretty unlikely source. during three campaign stops thursday in ohio, romney unveiled a new campaign message. >> it's time for a big change. and paul ryan and i represent a big change for america. >> reporter: in 2008, it was then-senator obama who ran on hope and change. >> hope and change are the story of our country. >> reporter: romney is arguing his ticket will fulfill that promise. >> america wants to see big changes, and we're going to bring big changes. >> even though my voice is getting kind of horse, i've still got a spring in my step. >> reporter: signs of losing his voice after a 48 hour, 8-state campaign swing, president obama made his final campaign stop in ohio, following rallies in florida, virginia, and a quick trip to chicago to cast his vote ahead of november 6th. the mega battlegrou